Whenever I see an em dash (—), I suspect the entire text was written by an AI.
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It's the literary equivalent of thinking someone must be a "hacker" because they have a Bash terminal open.
I'm pretty sure that all the comments about how it was "rarely seen" are because people weren't paying attention to them before in the way they do now.
In any case, to dismiss something as AI slap based solely on this one thing is both lazy and rude, and should be treated as such.